Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf37234cbb421ea…

MALICIOUS

PDF

84.8 KB Created: 2021-07-08 06:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 401215dfb4af9f9d795cb10a4ed8767d SHA-1: b13fdd34772f5bf29eb59ab27940ed794c8fd5b7 SHA-256: 0bf37234cbb421ea1e27854a6653de59b9104b98fd70bf7acbde8e0584f201ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics indicate the PDF acts as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs and link farm structure suggest the primary goal is to redirect users to external malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://huntic.ru/uplcv?utm_term=cuteness+overloaded+meaning
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6ded419634ceea7c0b5646cd8ed3b251/pewunuxikomijuxodofi.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/tvq5f9me7vu3l72cvsuej4gscu/17394310136.pdf
    • http://shqinze.net/admin/upimg/file///jisasuxanijatiware.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16079534679386---xatususivupiw.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/14218445d096f7466e9d58ccc0cd8a33/zudogisepaxewevaweruv.pdf
    • https://medtek.vn/storage/file/24490556911.pdf
    • http://nyett.hk/uploads/news/files/mikuxiputinu.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/09u4bo0tb9lpqgpme0g6jj5ttj/refovajexokuvaregixem.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160bda08acfe44---powasorugukaf.pdf
    • https://nepalimodelagency.com/userfiles/file/10666808358.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/genejobijirozevaka.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f3262d71b---74783041836.pdf
    • http://clubselectionvoyages.com/images/file/numulirefavopis.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0a5fb4dc2---56759841561.pdf
    • http://supermarketdv.ru/files/file/21158962639.pdf
    • https://bhsbeacon.com/FCKeditor/file/bisebeso.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/2493f60f7ce3e8937df54684ee4a1526/bedude.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2c1b46947e---30177302791.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a10e020cb---22903440335.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160cffa559492e---xumafoso.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/eah16if11kulplripdq8go9rqb/29423196587.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE00F 16792 bytes
font_01_sfnt_off0000f821.bin
ad94ec058b5e913518a9bc2f51ebccd4d2ee1266c2eed26597eb1ea53d75dd17
pdf-font-stream PDF embedded font (sfnt) at offset 0xF821 22736 bytes
font_02_sfnt_off00012d7c.bin
8bea1dc6c4731c007406ed800b1e3dbcaab2f7445cec8a2f113569e4fc047ad3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D7C 10788 bytes